The dinoflagellate
Peridinium bipes was irradiated with ultravilet (UV) lamps which emit 253.7 nmlight. The relationship between the time required for all the cells to die and the strength of continuous UV radiation was expressed by a hyperbolic curve, i, e., all the cells died by 6 hr and 48 hr under continuous UV radiation greater than 2400 and 80μW cm
-2, respectively. The time required for all the live cells to die after a certain of continuous UV radiation also conforms to a hyperbolic relation with strength of UV radiation, i. e., all the live cells were killed by UV radiation of 80μm cm
-2 for longer than 2 hr and 2400μm cm
-2 for longer than 1 min within 6 and 19 days, respectively.
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